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Sony STR-D715 Protect Mode

I have a Sony STR-D715 that I'm working on. I picked it up from a guy who said it stayed in protect mode. I had it on my bench with nothing hooked up to it and it is in protect mode. So I do some looking and I notice that a few parts on the right channel where burned. A couple transistors and 2 resistors later, I replaced the noticably burned parts and parts with shorts on them. I can't find any more shorts and it is still in protect mode. I might have narrowed it down to the stk3102 amp but I'm not sure how to check the part to see if it is working properly. Does anyone have experience with this or know a quick and dirty way to check the amp ics? I have the schematics for it if someone needs those to look at. Thanks

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Hello,
This is a common problem...
It is in fact a bad power-amp module.
I have repaired quite a few of these receivers by replacing it.
The module is inexpensive. I Googled the Part number and found several sources for it.

Good luck!

Posted on Oct 10, 2009

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When in protection mode the unit is prevented from starting by protection circuit, so to prevent further damage.

Check the speakers and speakers wiring, a contact in speaker wires, or faulty speakers can send the unit in protection.

Try unplugging power cable for one hour or so. then connect cable back and see if you get rid of protect state. Sometimes accumulation of electrostatic charges inside circuit capacitors can kick in protect mode. In that case unplugging the unit from main for some times can get rid of electrostatic charges, and reset circuits by draining power completely.
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If you do all the above and still get Protect, then there is a real fault.

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